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Keywords:

  • heme proteins;
  • metalloenzymes;
  • non-natural amino acids;
  • sustainable chemistry;
  • tyr-cys cofactor
Thumbnail image of graphical abstract

Efficient multiple-electron redox reactions are performed by galactoase oxidase, cysteine dioxygenase, sulfite reductase, and cytochrome c nitrite reductase. A post-translationally modified tyrosine–cysteine cross-link (Tyr-Cys) in their active sites is essential for their functions.